Across
- 5. The contamination of a stream, lake, river, ocean by harmful substances and chemicals.
- 9. When radiation from the Earth's atmosphere warms the planet's surface to a higher temperature than would be normal.
- 10. A layer of water floating on the surface of the water.
- 11. A source of energy that can be reused.
Down
- 1. a layer in the atmosphere that protects the planet from radiation
- 2. A big mass or river of ice.
- 3. An alteration of the long-term pattern of weather in a specific area.
- 4. A rise in the Earth's temperature.
- 6. Precipitation that is acidic.
- 7. These are polluting gases that are discharged from engines.
- 8. The process of converting waste into a new reusable product.